a carnival charges $8.50 per ticket for adults and $4.50 per ticket for children. which expression represents the total price a group of x adults and y children would pay to go to the carnival? A. 4.5x +8.5y B. 8.5x - 4.5y C. (4.5 + 8.5)(x + y) D. 8.5x + 4.5y